This book includes the proceedings of the 8th International Workshop on Computational Kinematics (CK2025) held in Chennai, India, during November 25-26, 2025. Computational Kinematics is the science of analysis and synthesis of motions in mechanisms and robots, covering both the theoretical as well as computational aspects of these. The 23 research papers presented here cover a range of the topics from computational geometry and theoretical kinematics, analysis and synthesis of mechanisms, to motion planning and control of robots, to kinematic aspects of biomechanics. These research contributions have been received from 11 different countries, and were selected via a rigorous process of peer review by globally renowned experts in the field. This book can be of interest to researchers in the field, as well as students and engineers working on design and analysis of mechanisms and robots, biomechanics and many other applications of computational kinematics.